Imagine that science has discovered a common virus that is known to cause cancer. Now imagine that science has created a vaccine that prevents people from contracting the virus. If you have kids, would you give your children the vaccine? Of course you would. Children get vaccines for many viruses like mumps, measles, polio, etc. as an effective way of protecting them against disease.
But if you are religious, and if the disease is Cervical cancer, and the preventitive step is the HPV vaccination, then all bets are off, as demonstrated by this article:
in this case, Christian parents are intentionally denying their children protection against a common form of cancer because of their religious delusion. The delusion is so advanced that it has impaired the ability of parents to protect their own children. That is a powerful delusion.